fix: remove it from setup cfg

Author: gadomski

setup.cfg

@@ -10,7 +10,7 @@ url = https://github.com/stactools-modis/stactools-modis
 project_urls =
     Documentation = https://stactools-modis.readthedocs.io/en/latest/
     Issues = https://github.com/stactools-modis/stactools-modis/issues
-keywords = 
+keywords =
     stactools
     pystac
     catalog
@@ -19,8 +19,6 @@ keywords =
 classifiers =
     Development Status :: 4 - Beta
     License :: OSI Approved :: Apache Software License
-    Programming Language :: Python :: 3.7
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
 
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